实例序列图最适合于在软件开发生命周期的分析阶段对个别方案建模。
Instance sequence diagrams are best for modeling individual scenarios during the analysis phases of the software development life cycle.
本书假设读者对软件开发生命周期过程和最佳实践已有一个基本的理解。
Though not technical in nature, the book does assume a basic understanding of the software development lifecycle process and best practices.
软件需求在软件产品的整个生命周期中占有十分重要的位置，对后续的软件开发和维护的成败具有决定性意义。
The software requirements is very important in the the entire life cycle of software products, and that has decisive significance for the follow-up of software development and maintenance.
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